sin(sec(x)*arctan(x))=x+20/5!*x^5-784/7!*x^7+26256/9!*x^9...

A012802

sin(sec(x)*arctan(x))=x+20/5!*x^5-784/7!*x^7+26256/9!*x^9...

Terms

    a(0) =1a(1) =0a(2) =20a(3) =-784a(4) =26256a(5) =-4466176a(6) =435729216a(7) =-104111460608

External references